P0420 avensis

toyotaavensis

Hi All,

P0420 on the avensis. It passed the NCT emissions test. All values were very similar to the last 4 NCT's. Am I right in thinking that this is just a faulty sensor?

biko

How old is code? Clear it and see if you get it again.
But yeah, if you passed emission at least car seems to be ok generally.

toyotaavensis

I have it a few months now. Every time I clear it comes back within a day.
I have the Torque app and I get this when I do diagnostics which makes me think the sensor is wrong

Mode $06 report generated by Torque for Android
================================================

Vehicle VIN: Not present
Vehicle Manufacturer: Unknown
Vehicle Calibration ID: 30517000

Unit and scaling information are not supplied with the data from the ECU for this type of vehicle. Consulting the manufacturers service book for this information is recommended.

Test report:

---

TID:$01 CID:$01
- Rich to Lean sensor threshold voltage(constant)
Max: 128
Test result value: 129
FAIL
----
TID:$04 CID:$01
- High sensor Voltage for switch time calculation
Min: 3,277
Test result value: 9,675
PASS
----
TID:$04 CID:$02
- High sensor Voltage for switch time calculation
Min: 3,277
Test result value: 7,979
PASS
----


End of report.

ofcork

I had that on my last avensis for over 3 years and passed all nct tests,kearys wanted 800 to change the cat but had no hassle with it so left it.

PADRAIC.M

What year is your Avensis? Does it have a cable throttle body or electric motor? If it has a cable throttle there was a software update to change the logic to detecting p0420, but as that's only A16bit ecu it can't be reprogrammed, so changing ecu with new type is only way of fixing this. But as its passing emissions, I wouldnt be too worried about it.

toyotaavensis

2003 it is a cable. To be honest, I wouldn't go to the bother of changing the ECU. If it was just a sensor fair enough but that would be a bit too much work.

I ll just leave it as is for now.